<template>
  <div class="component-container">
    <div class="component-container__main">
      <el-card class="box-card">
        <template #header>
          <span>商品规格</span>
          <el-button
            type="success"
            size="small"
            class="float-right"
            @click="handleSpecAdd"
          >
            <i-ep-plus /> 添加规格项
          </el-button>
        </template>

        <el-form
          ref="specFormRef"
          :model="specForm"
          :inline="true"
          size="small"
        >
          <el-table
            ref="specTableRef"
            :data="specForm.specList"
            row-key="id"
            size="small"
          >
            <el-table-column align="center" width="50">
              <template #default>
                <svg-icon class="drag-handler" icon-class="drag" />
              </template>
            </el-table-column>
            <el-table-column label="规格名" width="200">
              <template #default="scope">
                <el-form-item
                  :prop="'specList[' + scope.$index + '].name'"
                  :rules="rules.spec.name"
                >
                  <el-input
                    v-model="scope.row.name"
                    type="text"
                    size="small"
                    @input="handleSpecChange()"
                  />
                </el-form-item>
              </template>
            </el-table-column>
            <el-table-column>
              <template #header>
                规格值
                <el-link
                  type="danger"
                  style="font-size: 12px"
                  :underline="false"
                  >（默认第一条规格包含图片）</el-link
                >
              </template>

              <template #default="scope">
                <div
                  v-for="item in scope.row.values"
                  :key="item.id"
                  style="display: inline-block; margin-right: 15px"
                >
                  <el-tag
                    size="small"
                    closable
                    :type="colors[scope.$index % colors.length] as any"
                    @close="handleSpecValueRemove(scope.$index, item.id)"
                  >
                    {{ item.value }}
                  </el-tag>
                  <single-upload
                    v-if="scope.$index == 0"
                    v-model="item.picUrl"
                    style="margin-top: 5px"
                  />
                </div>

                <el-input
                  v-if="tagInputs.length > 0 && tagInputs[scope.$index].visible"
                  v-model="tagInputs[scope.$index].value"
                  style="width: 80px; vertical-align: top"
                  size="small"
                  @keyup.enter="handleSpecValueInput(scope.$index)"
                  @blur="handleSpecValueInput(scope.$index)"
                />
                <el-button
                  v-else
                  style="vertical-align: top"
                  size="small"
                  @click="handleSpecValueAdd(scope.$index)"
                >
                  <i-ep-plus /> 添加规格值
                </el-button>
              </template>
            </el-table-column>

            <el-table-column width="60" label="操作">
              <template #default="scope">
                <el-button
                  type="danger"
                  size="small"
                  circle
                  plain
                  @click.stop="handleSpecRemove(scope.$index)"
                  ><i-ep-minus />
                </el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-form>
      </el-card>

      <el-card class="box-card">
        <template #header>
          <span>商品库存</span>
        </template>
        <el-form ref="skuFormRef" :model="skuForm" size="small" :inline="true">
          <el-table
            :data="skuForm.skuList"
            :span-method="objectSpanMethod as any"
            highlight-current-row
            size="small"
            border
          >
            <el-table-column
              v-for="(title, index) in specTitles"
              :key="index"
              align="center"
              :prop="'specValue' + (index + 1)"
              :label="title"
            />

            <el-table-column label="商品编码" align="center">
              <template #default="scope">
                <el-form-item
                  :prop="'skuList[' + scope.$index + '].skuSn'"
                  :rules="rules.sku.skuSn"
                >
                  <el-input v-model="scope.row.skuSn" />
                </el-form-item>
              </template>
            </el-table-column>

            <el-table-column label="价格" align="center">
              <template #default="scope">
                <el-form-item
                  :prop="'skuList[' + scope.$index + '].price'"
                  :rules="rules.sku.price"
                >
                  <el-input v-model="scope.row.price" />
                </el-form-item>
              </template>
            </el-table-column>

            <el-table-column label="库存" align="center">
              <template #default="scope">
                <el-form-item
                  :prop="'skuList[' + scope.$index + '].stock'"
                  :rules="rules.sku.stock"
                >
                  <el-input v-model="scope.row.stock" />
                </el-form-item>
              </template>
            </el-table-column>
          </el-table>
        </el-form>
      </el-card>
    </div>
    <div class="component-container__footer">
      <el-button @click="handlePrev">上一步，设置商品属性</el-button>
      <el-button type="primary" @click="submitForm">提交</el-button>
    </div>
  </div>
</template>

<script setup lang="ts">
// API 引用
import { getAttributeList } from "@/api/pms/attribute";
import { addSpu, updateSpu } from "@/api/pms/goods";

const emit = defineEmits(["prev", "next", "update:modelValue"]);
import { useRouter } from "vue-router";

const router = useRouter();

const specFormRef = ref(ElForm);
const skuFormRef = ref(ElForm);

const props = defineProps({
  modelValue: {
    type: Object,
    default: () => {
      return {};
    },
  },
});

const goodsInfo: any = computed({
  get: () => props.modelValue,
  set: (value) => {
    emit("update:modelValue", value);
  },
});

const state = reactive({
  specForm: {
    specList: [] as any[],
  },
  skuForm: {
    skuList: [] as any[],
  },
  // 规格项表格标题
  specTitles: [] as any[],
  rules: {
    spec: {
      name: [{ required: true, message: "请输入规格名称", trigger: "blur" }],
      value: [{ required: true, message: "请输入规格值", trigger: "blur" }],
    },
    sku: {
      skuSn: [{ required: true, message: "请输入商品编号", trigger: "blur" }],
      price: [{ required: true, message: "请输入商品价格", trigger: "blur" }],
      stock: [{ required: true, message: "请输入商品库存", trigger: "blur" }],
    },
  },
  colors: ["", "success", "warning", "danger"],
  tagInputs: [{ value: undefined, visible: false }], // 规格值标签临时值和显隐控制
});

const { specForm, skuForm, specTitles, rules, colors, tagInputs } =
  toRefs(state);

watch(
  () => goodsInfo.value.categoryId,
  (newVal) => {
    // 商品编辑不加载分类下的规格
    const goodsId = goodsInfo.value.id;
    if (goodsId) {
      return false;
    }
    if (newVal) {
      // type=1 商品分类下的规格
      getAttributeList({ categoryId: newVal, type: 1 }).then((response) => {
        const specList = response.data;
        if (specList && specList.length > 0) {
          specList.forEach((item: any) => {
            state.specForm.specList.push({
              name: item.name,
              values: [],
            });
          });
          loadData();
        }
      });
    }
  },
  {
    immediate: true,
    deep: true,
  }
);

watch(state.specForm.specList, () => {
  generateSkuList();
});

function loadData() {
  goodsInfo.value.specList.forEach((specItem: any) => {
    const specIndex = state.specForm.specList.findIndex(
      (item: any) => item.name == specItem.name
    );
    if (specIndex > -1) {
      (state.specForm.specList[specIndex] as any).values.push({
        id: specItem.id,
        value: specItem.value,
        picUrl: specItem.picUrl,
      });
    } else {
      state.specForm.specList.push({
        name: specItem.name,
        values: [
          { id: specItem.id, value: specItem.value, picUrl: specItem.picUrl },
        ],
      });
    }
  });

  // 每个规格项追加一个添加规格值按钮
  for (let i = 0; i < state.specForm.specList.length; i++) {
    state.tagInputs.push({ value: undefined, visible: false });
  }

  // SKU规格ID拼接字符串处理
  goodsInfo.value.skuList.forEach((sku: any) => {
    sku.specIdArr = sku.specIds.split("_");
  });

  generateSkuList();

  handleSpecChange();

  handleSpecReorder();
}

/**
 * 生成SKU列表的title
 */
function handleSpecChange() {
  const specList = JSON.parse(JSON.stringify(state.specForm.specList));
  state.specTitles = specList.map((item: any) => item.name);
}

/**
 * 规格列表重排序
 */
function handleSpecReorder() {
  state.specForm.specList.forEach((item, index) => {
    item.index = index;
  });
}

/**
 *  根据商品规格笛卡尔积生成SKU列表
 *
 * 规格列表：
 * [
 *    { 'id':1,'name':'颜色','values':[{id:1,value:'白色'},{id:2,value:'黑色'},{id:3,value:'蓝色'}] },
 *    { 'id':2,'name':'版本','values':[{id:1,value:'6+128G'},{id:2,value:'8+128G'},{id:3,value:'8G+256G'}] }
 * ]
 */
function generateSkuList() {
  // 如果规格为空，生成SKU列表为空
  if (state.specForm.specList.length == 0) {
    state.skuForm.skuList = [];
    return;
  }

  const specList = JSON.parse(
    JSON.stringify(
      state.specForm.specList.filter(
        (item) => item.values && item.values.length > 0
      )
    )
  ); // 深拷贝，取有属性的规格项，否则笛卡尔积运算得到的SKU列表值为空

  const skuList = specList.reduce(
    (acc: any, curr: any) => {
      let result = [] as any[];
      acc.forEach((item: any) => {
        // curr => { 'id':1,'name':'颜色','values':[{id:1,value:'白色'},{id:2,value:'黑色'},{id:3,value:'蓝色'}] }
        curr.values.forEach((v: any) => {
          // v=>{id:1,value:'白色'}
          let temp = Object.assign({}, item);
          temp.specValues += v.value + "_"; // 规格值拼接
          temp.specIds += v.id + "|"; // 规格ID拼接
          result.push(temp);
        });
      });
      return result;
    },
    [{ specValues: "", specIds: "" }]
  );

  skuList.forEach((item: any) => {
    item.specIds = item.specIds.substring(0, item.specIds.length - 1);
    item.name = item.specValues
      .substring(0, item.specValues.length - 1)
      .replaceAll("_", " ");
    const specIdArr = item.specIds.split("|");
    const skus = goodsInfo.value.skuList.filter(
      (sku: any) =>
        sku.specIdArr.length === specIdArr.length &&
        sku.specIdArr.every((a: any) => specIdArr.some((b: any) => a === b)) &&
        specIdArr.every((x: any) => sku.specIdArr.some((y: any) => x === y))
    ); // 数据库的SKU列表

    if (skus && skus.length > 0) {
      const sku = skus[0];
      item.id = sku.id;
      item.skuSn = sku.skuSn;
      item.price = sku.price / 100;
      item.stock = sku.stock;
    }
    const specValueArr = item.specValues
      .substring(0, item.specValues.length - 1)
      .split("_"); // ['黑','6+128G','官方标配']
    specValueArr.forEach((v: any, i: any) => {
      const key = "specValue" + (i + 1);
      item[key] = v;
      if (i == 0 && state.specForm.specList.length > 0) {
        const valueIndex = state.specForm.specList[0].values.findIndex(
          (specValue: any) => specValue.value == v
        );
        if (valueIndex > -1) {
          item.picUrl = state.specForm.specList[0].values[valueIndex].picUrl;
        }
      }
    });
  });
  state.skuForm.skuList = JSON.parse(JSON.stringify(skuList));
}

/**
 * 添加规格
 */
function handleSpecAdd() {
  if (state.specForm.specList.length >= 3) {
    ElMessage.warning("最多支持3组规格");
    return;
  }
  state.specForm.specList.push({ values: [] });
  state.tagInputs.push({ value: undefined, visible: false });
  handleSpecReorder();
}

/**
 * 删除规格
 * @param index
 */
function handleSpecRemove(index: any) {
  state.specForm.specList.splice(index, 1);
  state.tagInputs.splice(index, 1);
  generateSkuList();
  handleSpecReorder();
  handleSpecChange();
}

/**
 * 添加规格值
 *
 * @param specIndex
 */
function handleSpecValueAdd(specIndex: any) {
  state.tagInputs[specIndex].visible = true;
}

/**
 *  删除规格值
 *
 * @param rowIndex
 * @param specValueId
 */
function handleSpecValueRemove(rowIndex: any, specValueId: any) {
  const specList = JSON.parse(JSON.stringify(state.specForm.specList));
  const removeIndex = specList[rowIndex].values
    .map((item: any) => item.id)
    .indexOf(specValueId);
  specList[rowIndex].values.splice(removeIndex, 1);
  state.specForm.specList = specList;
  generateSkuList();
  handleSpecChange();
  handleSpecReorder();
}

/**
 * 规格值输入
 */
function handleSpecValueInput(rowIndex: any) {
  const currSpecValue = state.tagInputs[rowIndex].value;
  const specValues = state.specForm.specList[rowIndex].values;
  if (
    specValues &&
    specValues.length > 0 &&
    specValues.map((item: any) => item.value).includes(currSpecValue)
  ) {
    ElMessage.warning("规格值重复，请重新输入");
    return false;
  }
  if (currSpecValue) {
    if (specValues && specValues.length > 0) {
      // 临时规格值ID tid_1_1
      let maxSpecValueIndex = specValues
        .filter((item: any) => item.id.includes("tid_"))
        .map((item: any) => item.id.split("_")[2])
        .reduce((acc: any, curr: any) => {
          return acc > curr ? acc : curr;
        }, 0);
      state.specForm.specList[rowIndex].values[specValues.length] = {
        value: currSpecValue,
        id: "tid_" + (rowIndex + 1) + "_" + ++maxSpecValueIndex,
      };
    } else {
      state.specForm.specList[rowIndex].values = [
        { value: currSpecValue, id: "tid_" + (rowIndex + 1) + "_1" },
      ];
    }
  }
  state.tagInputs[rowIndex].value = undefined;
  state.tagInputs[rowIndex].visible = false;
  generateSkuList();
}

/**
 * 合并规格单元格
 *
 * @param cellObj 单元格对象
 */

const objectSpanMethod = ({ rowIndex, columnIndex }: any) => {
  let mergeRows = [1, 1, 1]; // 分别对应规格1、规格2、规格3列合并的行数
  const specLen = state.specForm.specList.filter(
    (item) => item.values && item.values.length > 0
  ).length;
  if (specLen == 2) {
    const values_len_2 = state.specForm.specList[1].values
      ? state.specForm.specList[1].values.length
      : 1; // 第2个规格项的规格值的数量
    mergeRows = [values_len_2, 1, 1];
  } else if (specLen == 3) {
    const values_len_2 = state.specForm.specList[1].values
      ? state.specForm.specList[1].values.length
      : 1; // 第2个规格项的规格值的数量
    const values_len_3 = state.specForm.specList[2].values
      ? state.specForm.specList[2].values.length
      : 1; // 第3个规格项的规格值的数量
    mergeRows = [values_len_2 * values_len_3, values_len_3, 1];
  }
  if (columnIndex == 0) {
    if (rowIndex % mergeRows[0] === 0) {
      return [mergeRows[0], 1]; // 合并单元格
    } else {
      return [0, 0]; // 隐藏单元格
    }
  }
  if (columnIndex == 1) {
    if (rowIndex % mergeRows[1] === 0) {
      return [mergeRows[1], 1]; // 合并单元格
    } else {
      return [0, 0]; // 隐藏单元格
    }
  }
};

/**
 * 商品表单提交
 */
function submitForm() {
  // 判断商品SKU列表是否为空
  if (!state.skuForm.skuList || state.skuForm.skuList.length === 0) {
    ElMessage.warning("未添加商品库存");
    return false;
  }
  specFormRef.value.validate((specValid: any) => {
    if (specValid) {
      skuFormRef.value.validate((skuValid: any) => {
        if (skuValid) {
          // 重组商品的规格和SKU列表
          let submitsData = Object.assign({}, goodsInfo.value);
          delete submitsData.specList;
          delete submitsData.skuList;

          let specList = [] as any[];
          state.specForm.specList.forEach((item) => {
            item.values.forEach((value: any) => {
              value.name = item.name;
            });
            specList = specList.concat(item.values);
          });
          submitsData.specList = specList; // 规格列表

          submitsData.price *= 100; // 金额转成分保存至数据库
          submitsData.originPrice *= 100;

          let skuList = JSON.parse(JSON.stringify(state.skuForm.skuList));
          skuList.map((item: any) => {
            item.price *= 100;
            return item;
          });
          submitsData.skuList = skuList;
          const goodsId = goodsInfo.value.id;
          if (goodsId) {
            // 编辑商品提交
            updateSpu(goodsId, submitsData).then(() => {
              router.push({ path: "/pms/goods" });
              ElNotification({
                title: "提示",
                message: "编辑商品成功",
                type: "success",
              });
            });
          } else {
            // 新增商品提交
            addSpu(submitsData).then(() => {
              router.push({ path: "/pms/goods" });
              ElNotification({
                title: "提示",
                message: "新增商品成功",
                type: "success",
              });
            });
          }
        }
      });
    }
  });
}

function handlePrev() {
  emit("prev");
}

onMounted(() => {
  loadData();
});
</script>

<style lang="scss" scoped>
.component-container {
  &__main {
    margin: 20px auto;
  }

  &__footer {
    position: fixed;
    right: 20px;
    bottom: 20px;
  }

  .box-card {
    margin-bottom: 20px;
  }
}

.el-form--inline .el-form-item {
  margin-top: 18px;
}
</style>
